Guyker Guitar Locking Tuners (3L + 3R) 1:21 High End Roto Grip Rotomatic Lock String Tuning Key Pegs Machine Head with Big Handle Replacement for Electric, Folk or Acoustic Guitars Gold

Precision 1:21 gear ratio with sealed lubrication, cast housings and metal knobs. Gear Ratio - 1:21, designed to fit modern 10mm headstock peg holes. Comfortable and easy for adjustment of string tension. Half moon shaped button with sealed housing and 90 degree fixing tag. Mounting hardware (screws, bushings and washers) included. Guitar locking tuning machines with heavy duty internal gear, sturdy and convenient. Easy to install, easy to replace your old or dirty guitar tuning pegs. Please check the parameter drawing in the attached pics before placing your order.